<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `RefCell` struct in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, RefCell"><title>core::cell::RefCell - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../core/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><p class='location'>Struct RefCell</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.as_ptr">as_ptr</a><a href="#method.borrow">borrow</a><a href="#method.borrow_mut">borrow_mut</a><a href="#method.get_mut">get_mut</a><a href="#method.into_inner">into_inner</a><a href="#method.new">new</a><a href="#method.replace">replace</a><a href="#method.replace_with">replace_with</a><a href="#method.swap">swap</a><a href="#method.try_borrow">try_borrow</a><a href="#method.try_borrow_mut">try_borrow_mut</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-CoerceUnsized%3CRefCell%3CU%3E%3E">CoerceUnsized<RefCell<U>></a><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a><a href="#impl-Eq">Eq</a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Ord">Ord</a><a href="#impl-PartialEq%3CRefCell%3CT%3E%3E">PartialEq<RefCell<T>></a><a href="#impl-PartialOrd%3CRefCell%3CT%3E%3E">PartialOrd<RefCell<T>></a><a href="#impl-Send">Send</a><a href="#impl-Sync">!Sync</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow">Borrow</a><a href="#impl-BorrowMut">BorrowMut</a><a href="#impl-From">From</a><a href="#impl-Into">Into</a><a href="#impl-TryFrom">TryFrom</a><a href="#impl-TryInto">TryInto</a></div></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>cell</a></p><script>window.sidebarCurrent = {name: 'RefCell', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/core/cell.rs.html#567-570' title='goto source code'>[src]</a></span><span class='in-band'>Struct <a href='../index.html'>core</a>::<wbr><a href='index.html'>cell</a>::<wbr><a class="struct" href=''>RefCell</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust struct'>pub struct RefCell<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> { /* fields omitted */ }</pre></div><div class='docblock'><p>A mutable memory location with dynamically checked borrow rules</p>
<p>See the <a href="index.html">module-level documentation</a> for more.</p>
</div><h2 id='methods' class='small-section-header'>Methods<a href='#methods' class='anchor'></a></h2><h3 id='impl' class='impl'><code class='in-band'>impl<T> <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#638-750' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.new' class="method"><code id='new.v'>pub const fn <a href='#method.new' class='fnname'>new</a>(value: T) -> <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a class='srclink' href='../../src/core/cell.rs.html#650-655' title='goto source code'>[src]</a></h4><div class='docblock'><p>Creates a new <code>RefCell</code> containing <code>value</code>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.into_inner' class="method"><code id='into_inner.v'>pub fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -> T</code><a class='srclink' href='../../src/core/cell.rs.html#670-676' title='goto source code'>[src]</a></h4><div class='docblock'><p>Consumes the <code>RefCell</code>, returning the wrapped value.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">five</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">into_inner</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%0Alet%20five%20%3D%20c.into_inner()%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.replace' class="method"><code id='replace.v'>pub fn <a href='#method.replace' class='fnname'>replace</a>(&self, t: T) -> T</code><div class='since' title='Stable since Rust version 1.24.0'>1.24.0</div><a class='srclink' href='../../src/core/cell.rs.html#698-700' title='goto source code'>[src]</a></h4><div class='docblock'><p>Replaces the wrapped value with a new one, returning the old value,
without deinitializing either one.</p>
<p>This function corresponds to <a href="../mem/fn.replace.html"><code>std::mem::replace</code></a>.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>Panics if the value is currently borrowed.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">cell</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">old_value</span> <span class="op">=</span> <span class="ident">cell</span>.<span class="ident">replace</span>(<span class="number">6</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">old_value</span>, <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>, <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">6</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0Alet%20cell%20%3D%20RefCell%3A%3Anew(5)%3B%0Alet%20old_value%20%3D%20cell.replace(6)%3B%0Aassert_eq!(old_value%2C%205)%3B%0Aassert_eq!(cell%2C%20RefCell%3A%3Anew(6))%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.replace_with' class="method"><code id='replace_with.v'>pub fn <a href='#method.replace_with' class='fnname'>replace_with</a><F: <a class="trait" href="../../core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</a>(&mut T) -> T>(&self, f: F) -> T</code><div class='since' title='Stable since Rust version 1.35.0'>1.35.0</div><a class='srclink' href='../../src/core/cell.rs.html#720-724' title='goto source code'>[src]</a></h4><div class='docblock'><p>Replaces the wrapped value with a new one computed from <code>f</code>, returning
the old value, without deinitializing either one.</p>
<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
<p>Panics if the value is currently borrowed.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">cell</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">old_value</span> <span class="op">=</span> <span class="ident">cell</span>.<span class="ident">replace_with</span>(<span class="op">|</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">old</span><span class="op">|</span> <span class="ident">old</span> <span class="op">+</span> <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">old_value</span>, <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>, <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">6</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0Alet%20cell%20%3D%20RefCell%3A%3Anew(5)%3B%0Alet%20old_value%20%3D%20cell.replace_with(%7C%26mut%20old%7C%20old%20%2B%201)%3B%0Aassert_eq!(old_value%2C%205)%3B%0Aassert_eq!(cell%2C%20RefCell%3A%3Anew(6))%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.swap' class="method"><code id='swap.v'>pub fn <a href='#method.swap' class='fnname'>swap</a>(&self, other: &Self)</code><div class='since' title='Stable since Rust version 1.24.0'>1.24.0</div><a class='srclink' href='../../src/core/cell.rs.html#747-749' title='goto source code'>[src]</a></h4><div class='docblock'><p>Swaps the wrapped value of <code>self</code> with the wrapped value of <code>other</code>,
without deinitializing either one.</p>
<p>This function corresponds to <a href="../mem/fn.swap.html"><code>std::mem::swap</code></a>.</p>
<h1 id="panics-2" class="section-header"><a href="#panics-2">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">6</span>);
<span class="ident">c</span>.<span class="ident">swap</span>(<span class="kw-2">&</span><span class="ident">d</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>, <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">6</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>, <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0Alet%20d%20%3D%20RefCell%3A%3Anew(6)%3B%0Ac.swap(%26d)%3B%0Aassert_eq!(c%2C%20RefCell%3A%3Anew(6))%3B%0Aassert_eq!(d%2C%20RefCell%3A%3Anew(5))%3B%0A%7D">Run</a></pre></div>
</div></div><h3 id='impl-1' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-1' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#752-958' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow' class="method"><code id='borrow.v'>pub fn <a href='#method.borrow' class='fnname'>borrow</a>(&self) -> <a class="struct" href="../../core/cell/struct.Ref.html" title="struct core::cell::Ref">Ref</a><T></code><a class='srclink' href='../../src/core/cell.rs.html#791-793' title='goto source code'>[src]</a></h4><div class='docblock'><p>Immutably borrows the wrapped value.</p>
<p>The borrow lasts until the returned <code>Ref</code> exits scope. Multiple
immutable borrows can be taken out at the same time.</p>
<h1 id="panics-3" class="section-header"><a href="#panics-3">Panics</a></h1>
<p>Panics if the value is currently mutably borrowed. For a non-panicking variant, use
<a href="#method.try_borrow"><code>try_borrow</code></a>.</p>
<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">borrowed_five</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow</span>();
<span class="kw">let</span> <span class="ident">borrowed_five2</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%0Alet%20borrowed_five%20%3D%20c.borrow()%3B%0Alet%20borrowed_five2%20%3D%20c.borrow()%3B%0A%7D">Run</a></pre></div>
<p>An example of panic:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow_mut</span>();
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow</span>(); <span class="comment">// this causes a panic</span>
}).<span class="ident">join</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="ident">is_err</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0Ause%20std%3A%3Athread%3B%0A%0Alet%20result%20%3D%20thread%3A%3Aspawn(move%20%7C%7C%20%7B%0A%20%20%20let%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%20%20%20let%20m%20%3D%20c.borrow_mut()%3B%0A%0A%20%20%20let%20b%20%3D%20c.borrow()%3B%20%2F%2F%20this%20causes%20a%20panic%0A%7D).join()%3B%0A%0Aassert!(result.is_err())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.try_borrow' class="method"><code id='try_borrow.v'>pub fn <a href='#method.try_borrow' class='fnname'>try_borrow</a>(&self) -> <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../../core/cell/struct.Ref.html" title="struct core::cell::Ref">Ref</a><T>, <a class="struct" href="../../core/cell/struct.BorrowError.html" title="struct core::cell::BorrowError">BorrowError</a>></code><div class='since' title='Stable since Rust version 1.13.0'>1.13.0</div><a class='srclink' href='../../src/core/cell.rs.html#822-830' title='goto source code'>[src]</a></h4><div class='docblock'><p>Immutably borrows the wrapped value, returning an error if the value is currently mutably
borrowed.</p>
<p>The borrow lasts until the returned <code>Ref</code> exits scope. Multiple immutable borrows can be
taken out at the same time.</p>
<p>This is the non-panicking variant of <a href="#method.borrow"><code>borrow</code></a>.</p>
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
{
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow_mut</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">try_borrow</span>().<span class="ident">is_err</span>());
}
{
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">try_borrow</span>().<span class="ident">is_ok</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%0A%7B%0A%20%20%20%20let%20m%20%3D%20c.borrow_mut()%3B%0A%20%20%20%20assert!(c.try_borrow().is_err())%3B%0A%7D%0A%0A%7B%0A%20%20%20%20let%20m%20%3D%20c.borrow()%3B%0A%20%20%20%20assert!(c.try_borrow().is_ok())%3B%0A%7D%0A%7D">Run</a></pre></div>
</div><h4 id='method.borrow_mut' class="method"><code id='borrow_mut.v'>pub fn <a href='#method.borrow_mut' class='fnname'>borrow_mut</a>(&self) -> <a class="struct" href="../../core/cell/struct.RefMut.html" title="struct core::cell::RefMut">RefMut</a><T></code><a class='srclink' href='../../src/core/cell.rs.html#872-874' title='goto source code'>[src]</a></h4><div class='docblock'><p>Mutably borrows the wrapped value.</p>
<p>The borrow lasts until the returned <code>RefMut</code> or all <code>RefMut</code>s derived
from it exit scope. The value cannot be borrowed while this borrow is
active.</p>
<h1 id="panics-4" class="section-header"><a href="#panics-4">Panics</a></h1>
<p>Panics if the value is currently borrowed. For a non-panicking variant, use
<a href="#method.try_borrow_mut"><code>try_borrow_mut</code></a>.</p>
<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw-2">*</span><span class="ident">c</span>.<span class="ident">borrow_mut</span>() <span class="op">=</span> <span class="number">7</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">c</span>.<span class="ident">borrow</span>(), <span class="number">7</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%0A*c.borrow_mut()%20%3D%207%3B%0A%0Aassert_eq!(*c.borrow()%2C%207)%3B%0A%7D">Run</a></pre></div>
<p>An example of panic:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow</span>();
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow_mut</span>(); <span class="comment">// this causes a panic</span>
}).<span class="ident">join</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="ident">is_err</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0Ause%20std%3A%3Athread%3B%0A%0Alet%20result%20%3D%20thread%3A%3Aspawn(move%20%7C%7C%20%7B%0A%20%20%20let%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%20%20%20let%20m%20%3D%20c.borrow()%3B%0A%0A%20%20%20let%20b%20%3D%20c.borrow_mut()%3B%20%2F%2F%20this%20causes%20a%20panic%0A%7D).join()%3B%0A%0Aassert!(result.is_err())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.try_borrow_mut' class="method"><code id='try_borrow_mut.v'>pub fn <a href='#method.try_borrow_mut' class='fnname'>try_borrow_mut</a>(&self) -> <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../../core/cell/struct.RefMut.html" title="struct core::cell::RefMut">RefMut</a><T>, <a class="struct" href="../../core/cell/struct.BorrowMutError.html" title="struct core::cell::BorrowMutError">BorrowMutError</a>></code><div class='since' title='Stable since Rust version 1.13.0'>1.13.0</div><a class='srclink' href='../../src/core/cell.rs.html#900-908' title='goto source code'>[src]</a></h4><div class='docblock'><p>Mutably borrows the wrapped value, returning an error if the value is currently borrowed.</p>
<p>The borrow lasts until the returned <code>RefMut</code> or all <code>RefMut</code>s derived
from it exit scope. The value cannot be borrowed while this borrow is
active.</p>
<p>This is the non-panicking variant of <a href="#method.borrow_mut"><code>borrow_mut</code></a>.</p>
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
{
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">borrow</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">try_borrow_mut</span>().<span class="ident">is_err</span>());
}
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">try_borrow_mut</span>().<span class="ident">is_ok</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%0A%7B%0A%20%20%20%20let%20m%20%3D%20c.borrow()%3B%0A%20%20%20%20assert!(c.try_borrow_mut().is_err())%3B%0A%7D%0A%0Aassert!(c.try_borrow_mut().is_ok())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.as_ptr' class="method"><code id='as_ptr.v'>pub fn <a href='#method.as_ptr' class='fnname'>as_ptr</a>(&self) -> *mut T</code><div class='since' title='Stable since Rust version 1.12.0'>1.12.0</div><a class='srclink' href='../../src/core/cell.rs.html#923-925' title='goto source code'>[src]</a></h4><div class='docblock'><p>Returns a raw pointer to the underlying data in this cell.</p>
<h1 id="examples-9" class="section-header"><a href="#examples-9">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">as_ptr</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A%0Alet%20ptr%20%3D%20c.as_ptr()%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.get_mut' class="method"><code id='get_mut.v'>pub fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut self) -> &mut T</code><div class='since' title='Stable since Rust version 1.11.0'>1.11.0</div><a class='srclink' href='../../src/core/cell.rs.html#953-957' title='goto source code'>[src]</a></h4><div class='docblock'><p>Returns a mutable reference to the underlying data.</p>
<p>This call borrows <code>RefCell</code> mutably (at compile-time) so there is no
need for dynamic checks.</p>
<p>However be cautious: this method expects <code>self</code> to be mutable, which is
generally not the case when using a <code>RefCell</code>. Take a look at the
<a href="#method.borrow_mut"><code>borrow_mut</code></a> method instead if <code>self</code> isn't mutable.</p>
<p>Also, please be aware that this method is only for special circumstances and is usually
not what you want. In case of doubt, use <a href="#method.borrow_mut"><code>borrow_mut</code></a> instead.</p>
<h1 id="examples-10" class="section-header"><a href="#examples-10">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw-2">*</span><span class="ident">c</span>.<span class="ident">get_mut</span>() <span class="op">+=</span> <span class="number">1</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>, <span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="number">6</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acell%3A%3ARefCell%3B%0A%0Alet%20mut%20c%20%3D%20RefCell%3A%3Anew(5)%3B%0A*c.get_mut()%20%2B%3D%201%3B%0A%0Aassert_eq!(c%2C%20RefCell%3A%3Anew(6))%3B%0A%7D">Run</a></pre></div>
</div></div><h2 id='implementations' class='small-section-header'>Trait Implementations<a href='#implementations' class='anchor'></a></h2><div id='implementations-list'><h3 id='impl-Send' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code><a href='#impl-Send' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#961' title='goto source code'>[src]</a></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> !<a class="trait" href="../../core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-Sync' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#964' title='goto source code'>[src]</a></h3><div class='impl-items'></div><h3 id='impl-CoerceUnsized%3CRefCell%3CU%3E%3E' class='impl'><code class='in-band'>impl<T: <a class="trait" href="../../core/ops/trait.CoerceUnsized.html" title="trait core::ops::CoerceUnsized">CoerceUnsized</a><U>, U> <a class="trait" href="../../core/ops/trait.CoerceUnsized.html" title="trait core::ops::CoerceUnsized">CoerceUnsized</a><<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><U>> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-CoerceUnsized%3CRefCell%3CU%3E%3E' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#1062' title='goto source code'>[src]</a></h3><div class='impl-items'></div><h3 id='impl-PartialEq%3CRefCell%3CT%3E%3E' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>> <a class="trait" href="../../core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a><<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-PartialEq%3CRefCell%3CT%3E%3E' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#987-995' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.eq' class="method"><code id='eq.v'>fn <a href='../../core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> bool</code><a class='srclink' href='../../src/core/cell.rs.html#992-994' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-5" class="section-header"><a href="#panics-5">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div><h4 id='method.ne' class="method"><code id='ne.v'><div class="docblock attributes">#[must_use]
</div>fn <a href='../../core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, other: &Rhs) -> bool</code><a class='srclink' href='../../src/core/cmp.rs.html#200' title='goto source code'>[src]</a></h4><div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-Eq' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>> <a class="trait" href="../../core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-Eq' class='anchor'></a><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div><a class='srclink' href='../../src/core/cell.rs.html#998' title='goto source code'>[src]</a></h3><div class='impl-items'></div><h3 id='impl-Ord' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-Ord' class='anchor'></a><div class='since' title='Stable since Rust version 1.10.0'>1.10.0</div><a class='srclink' href='../../src/core/cell.rs.html#1044-1052' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.cmp' class="method"><code id='cmp.v'>fn <a href='../../core/cmp/trait.Ord.html#tymethod.cmp' class='fnname'>cmp</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> <a class="enum" href="../../core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a></code><a class='srclink' href='../../src/core/cell.rs.html#1049-1051' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-6" class="section-header"><a href="#panics-6">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div><h4 id='method.max' class="method"><code id='max.v'>fn <a href='../../core/cmp/trait.Ord.html#method.max' class='fnname'>max</a>(self, other: Self) -> Self <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><div class='since' title='Stable since Rust version 1.21.0'>1.21.0</div><a class='srclink' href='../../src/core/cmp.rs.html#549-552' title='goto source code'>[src]</a></h4><div class='docblock'><p>Compares and returns the maximum of two values. <a href="../../core/cmp/trait.Ord.html#method.max">Read more</a></p>
</div><h4 id='method.min' class="method"><code id='min.v'>fn <a href='../../core/cmp/trait.Ord.html#method.min' class='fnname'>min</a>(self, other: Self) -> Self <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><div class='since' title='Stable since Rust version 1.21.0'>1.21.0</div><a class='srclink' href='../../src/core/cmp.rs.html#566-569' title='goto source code'>[src]</a></h4><div class='docblock'><p>Compares and returns the minimum of two values. <a href="../../core/cmp/trait.Ord.html#method.min">Read more</a></p>
</div><h4 id='method.clamp' class="method"><code id='clamp.v'>fn <a href='../../core/cmp/trait.Ord.html#method.clamp' class='fnname'>clamp</a>(self, min: Self, max: Self) -> Self <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a class='srclink' href='../../src/core/cmp.rs.html#590-600' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>clamp</code> <a href="https://github.com/rust-lang/rust/issues/44095">#44095</a>)</div></div><div class='docblock'><p>Restrict a value to a certain interval. <a href="../../core/cmp/trait.Ord.html#method.clamp">Read more</a></p>
</div></div><h3 id='impl-PartialOrd%3CRefCell%3CT%3E%3E' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>> <a class="trait" href="../../core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a><<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-PartialOrd%3CRefCell%3CT%3E%3E' class='anchor'></a><div class='since' title='Stable since Rust version 1.10.0'>1.10.0</div><a class='srclink' href='../../src/core/cell.rs.html#1001-1041' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.partial_cmp' class="method"><code id='partial_cmp.v'>fn <a href='../../core/cmp/trait.PartialOrd.html#tymethod.partial_cmp' class='fnname'>partial_cmp</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="../../core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>></code><a class='srclink' href='../../src/core/cell.rs.html#1006-1008' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-7" class="section-header"><a href="#panics-7">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div><h4 id='method.lt' class="method"><code id='lt.v'>fn <a href='../../core/cmp/trait.PartialOrd.html#method.lt' class='fnname'>lt</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> bool</code><a class='srclink' href='../../src/core/cell.rs.html#1014-1016' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-8" class="section-header"><a href="#panics-8">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div><h4 id='method.le' class="method"><code id='le.v'>fn <a href='../../core/cmp/trait.PartialOrd.html#method.le' class='fnname'>le</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> bool</code><a class='srclink' href='../../src/core/cell.rs.html#1022-1024' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-9" class="section-header"><a href="#panics-9">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div><h4 id='method.gt' class="method"><code id='gt.v'>fn <a href='../../core/cmp/trait.PartialOrd.html#method.gt' class='fnname'>gt</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> bool</code><a class='srclink' href='../../src/core/cell.rs.html#1030-1032' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-10" class="section-header"><a href="#panics-10">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div><h4 id='method.ge' class="method"><code id='ge.v'>fn <a href='../../core/cmp/trait.PartialOrd.html#method.ge' class='fnname'>ge</a>(&self, other: &<a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T>) -> bool</code><a class='srclink' href='../../src/core/cell.rs.html#1038-1040' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-11" class="section-header"><a href="#panics-11">Panics</a></h1>
<p>Panics if the value in either <code>RefCell</code> is currently borrowed.</p>
</div></div><h3 id='impl-Clone' class='impl'><code class='in-band'>impl<T: <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-Clone' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#967-975' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.clone' class="method"><code id='clone.v'>fn <a href='../../core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a class='srclink' href='../../src/core/cell.rs.html#972-974' title='goto source code'>[src]</a></h4><div class='docblock'><h1 id="panics-12" class="section-header"><a href="#panics-12">Panics</a></h1>
<p>Panics if the value is currently mutably borrowed.</p>
</div><h4 id='method.clone_from' class="method"><code id='clone_from.v'>fn <a href='../../core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code><a class='srclink' href='../../src/core/clone.rs.html#131-133' title='goto source code'>[src]</a></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="../../core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 id='impl-Default' class='impl'><code class='in-band'>impl<T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-Default' class='anchor'></a><a class='srclink' href='../../src/core/cell.rs.html#978-984' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.default' class="method"><code id='default.v'>fn <a href='../../core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a class='srclink' href='../../src/core/cell.rs.html#981-983' title='goto source code'>[src]</a></h4><div class='docblock'><p>Creates a <code>RefCell<T></code>, with the <code>Default</code> value for T.</p>
</div></div><h3 id='impl-From%3CT%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-From%3CT%3E' class='anchor'></a><div class='since' title='Stable since Rust version 1.12.0'>1.12.0</div><a class='srclink' href='../../src/core/cell.rs.html#1055-1059' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from' class="method hidden"><code id='from.v'>fn <a href='../../core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(t: T) -> <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a class='srclink' href='../../src/core/cell.rs.html#1056-1058' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id='impl-Debug' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code><a href='#impl-Debug' class='anchor'></a><a class='srclink' href='../../src/core/fmt/mod.rs.html#2127-2152' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt' class="method hidden"><code id='fmt.v'>fn <a href='../../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class='srclink' href='../../src/core/fmt/mod.rs.html#2128-2151' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="../../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div></div><h2 id='blanket-implementations' class='small-section-header'>Blanket Implementations<a href='#blanket-implementations' class='anchor'></a></h2><div id='blanket-implementations-list'><h3 id='impl-Into' class='impl'><code class='in-band'>impl<T, U> <a class="trait" href="../../core/convert/trait.Into.html" title="trait core::convert::Into">Into</a> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="../../core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></code><a href='#impl-Into' class='anchor'></a><a class='srclink' href='../../src/core/convert.rs.html#537-542' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.into' class="method hidden"><code id='into.v'>fn <a href='../../core/convert/trait.Into.html#tymethod.into' class='fnname'>into</a>(Self) -> U</code><a class='srclink' href='../../src/core/convert.rs.html#539-541' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id='impl-From' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../core/convert/trait.From.html" title="trait core::convert::From">From</a> for T</code><a href='#impl-From' class='anchor'></a><a class='srclink' href='../../src/core/convert.rs.html#546-548' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from-1' class="method hidden"><code id='from.v-1'>fn <a href='../../core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(T) -> T</code><a class='srclink' href='../../src/core/convert.rs.html#547' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id='impl-TryInto' class='impl'><code class='in-band'>impl<T, U> <a class="trait" href="../../core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="../../core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><a href='#impl-TryInto' class='anchor'></a><a class='srclink' href='../../src/core/convert.rs.html#553-560' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error' class="type"><code id='Error.t'>type <a href='../../core/convert/trait.TryInto.html#associatedtype.Error' class="type">Error</a> = <U as <a class="trait" href="../../core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="../../core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4 id='method.try_into' class="method hidden"><code id='try_into.v'>fn <a href='../../core/convert/trait.TryInto.html#tymethod.try_into' class='fnname'>try_into</a>(Self) -> <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="../../core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="../../core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class='srclink' href='../../src/core/convert.rs.html#557-559' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id='impl-TryFrom' class='impl'><code class='in-band'>impl<T, U> <a class="trait" href="../../core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="../../core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></code><a href='#impl-TryFrom' class='anchor'></a><a class='srclink' href='../../src/core/convert.rs.html#565-571' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error-1' class="type"><code id='Error.t-1'>type <a href='../../core/convert/trait.TryFrom.html#associatedtype.Error' class="type">Error</a> = <a class="enum" href="../../core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4 id='method.try_from' class="method hidden"><code id='try_from.v'>fn <a href='../../core/convert/trait.TryFrom.html#tymethod.try_from' class='fnname'>try_from</a>(U) -> <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="../../core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="type" href="../../core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class='srclink' href='../../src/core/convert.rs.html#568-570' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id='impl-Borrow' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Borrow' class='anchor'></a><a class='srclink' href='../../src/core/borrow.rs.html#213-215' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow-1' class="method hidden"><code id='borrow.v-1'>fn <a href='../../core/borrow/trait.Borrow.html#tymethod.borrow' class='fnname'>borrow</a>(&Self) -> &T</code><a class='srclink' href='../../src/core/borrow.rs.html#214' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="../../core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></div><h3 id='impl-BorrowMut' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-BorrowMut' class='anchor'></a><a class='srclink' href='../../src/core/borrow.rs.html#218-220' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow_mut-1' class="method hidden"><code id='borrow_mut.v-1'>fn <a href='../../core/borrow/trait.BorrowMut.html#tymethod.borrow_mut' class='fnname'>borrow_mut</a>(&mut Self) -> &mut T</code><a class='srclink' href='../../src/core/borrow.rs.html#219' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="../../core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></div><h3 id='impl-Any' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Any' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#100-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.type_id' class="method hidden"><code id='type_id.v'>fn <a href='../../core/any/trait.Any.html#tymethod.type_id' class='fnname'>type_id</a>(&Self) -> <a class="struct" href="../../core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class='srclink' href='../../src/core/any.rs.html#101' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="../../core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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